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There are two parts to the speed sensor, one is located at the bottom of the timing chain cover, this is the sensor that has the electrical harness plug into it and is on the outside of the timing chain cover. The other part is more complicated and this is the sensor located inside the timing chain cover and is like a magnet and its plugged in a hole on the lower timing chain gear. I replaced the magnet sensor on a 1988 buick riviera, the one that is located inside the timing belt cover, it is a pain to get to it, once you remove the timing belt cover you have to remove the timing chain and the timing chain sprockets,, the sensor is located behing the timing chain lower gear so you have to remove the gear and the sensor plugs into a hole on the gear itself. The way it works is like this,,,the magnet that is located on the lower gear inside the timing chain cover turns and when it turns it passes trough the sensor located on the outside of the timing gear when they meet it creates a electrical pulse read by the computer and it tells it the speed of the engine.
It is not necessary to change timing gears when changing a timing chain unless they have become worn. You won't know if this is the case until you get the cover off and inspect them. It is necessary to change any chain tensioners when you change your timing chain.
The camshaft position sensor is located on the timing chain cover at the front of the engine.
on the timing chain cover on right side
Removal of the timing chain cover, timing chain, and head are needed
the sensor itself is on the bottom of the timing chain cover on the left.
Behind the timing chain cover
front bottom of timing chain cover.
It is located on the timing chain cover.
Under the timing chain cover, attached with 2, 10mm bolts, directly to the right of crankshaft sprocket. Once the timing chain cover is off it will be easily visible.
next to the timing chain you will find it in the cover on front of engine where the water pump is mounted they call it the timing chain cover you will have to remove this cover to get at it
To change a Vauxhall Corsa timing change you need to first remove the rocker cover, the alternator tensioner, heat shield, water pump, engine mount, and crankshaft pulley. Now that you have found the timing change, unscrew the timing chain guides, remove old chain, and replace with new chain.